列表视图edittext数据在Android中滚动丢失
问题描述:
我希望列表视图有2个edittext来保存值,即使在滚动后变为不可见也是如此。当edittext损失集中时,我希望每个edittext值都保存在一个数组列表中(数组列表 - 一个用于数量级,一个用于价格),我可以保存到数据库中。 我试过OntextChanegd方法中的代码,但它看起来不正确。列表视图edittext数据在Android中滚动丢失
public class CustomAdapter extends BaseAdapter {
ArrayList<String> names;
Context context;
ArrayList<String> itemPrices = new ArrayList<>();
ArrayList<String> quantities = new ArrayList<>();
CustomAdapter(ArrayList v, Context c) {
names = v;
context = c;
}
@Override
public int getCount() {
return names.size();
}
@Override
public Object getItem(int position) {
return names.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
try {
final ViewHolder holder;
// TODO Auto-generated method stub
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row, null);
holder.textView = (TextView) convertView.findViewById(R.id.rowText);
holder.editQty = (EditText) convertView.findViewById(R.id.qty);
holder.editprice = (EditText) convertView.findViewById(R.id.price);
holder.textView.setTextSize(20);
holder.textView.setTextColor(Color.BLACK);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.ref = position;
holder.textView.setText(names.get(position));
holder.editQty.setHint("Quantity");
holder.editprice.setHint("Price");
holder.editQty.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
holder.editprice.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
}
});
return convertView;
}catch (NumberFormatException ex){
Toast.makeText(context,"!!!",Toast.LENGTH_SHORT).show();
ex.printStackTrace();
}
return convertView;
}
private class ViewHolder {
TextView textView;
EditText editQty;
EditText editprice;
int ref;
}
}
答
添加监听到ViewHolder
private class ViewHolder {
TextView textView;
EditText editQty;
EditText editprice;
TextWatcher qtyWatcher;
TextWatcher priceWatcher;
int ref;
}
现在在getView()方法去除的EditText现有的手表,然后更新中的EditText文字和设定新的观察家。
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
try {
final ViewHolder holder;
// TODO Auto-generated method stub
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.row, null);
holder.textView = (TextView) convertView.findViewById(R.id.rowText);
holder.editQty = (EditText) convertView.findViewById(R.id.qty);
holder.editprice = (EditText) convertView.findViewById(R.id.price);
holder.textView.setTextSize(20);
holder.textView.setTextColor(Color.BLACK);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.ref = position;
if (holder.qtyWatcher != null) {
holder.editQty.removeTextChangedListener(holder.qtyWatcher);
}
if (holder.priceWatcher != null) {
holder.editprice.removeTextChangedListener(holder.priceWatcher);
}
holder.textView.setText(names.get(position));
holder.editQty.setHint("Quantity");
holder.editprice.setHint("Price");
if(position<quantities.size())
holder.editQty.setText(quantities.get(position));
else
holder.editQty.setText("");
if(position<itemPrices.size())
holder.editprice.setText(itemPrices.get(position));
else
holder.editprice.setText("");
holder.qtyWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
//Update the quantity
}
};
holder.editQty.addTextChangedListener(holder.qtyWatcher);
holder.priceWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
//Update you price
}
};
holder.editprice.addTextChangedListener(holder.priceWatcher);
return convertView;
} catch (NumberFormatException ex) {
Toast.makeText(context, "!!!", Toast.LENGTH_SHORT).show();
ex.printStackTrace();
}
return convertView;
}
答
你需要对更新值保存到你的数据阵列,因为列表中使用循环视图。
holder.editQty.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
name.setValue(s);
}
@Override
public void afterTextChanged(Editable s) {
}
});
这会工作考虑失去在滚动过程中发生的? – Abhijith
holder.editQty.setText(quantities.get(position)); holder.editprice.setText(itemPrices.get(position)); 在上面的代码崩溃 – Abhijith
更新后的帖子看看。 错误,因为我有初始化编辑文本。 @Abhijith – Kartheek